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To talk to Costco Credit Card customer service, call 1-855-378-6467 and then enter the last four digits of your Costco Credit Card number and say customer service. This process will get you in contact with a live representative who should be able to answer your questions or direct you to the appropriate department.
How to Talk to Costco Credit Card Customer Service by Phone
- Call the Costco Credit Card customer service department. You can even use the number on the back of your card.
- Enter the last four digits of your Costco Credit Card number.
- Then, say customer service".
- Speak to the live representative.
If you can’t or don’t want to talk to the Costco Credit Card customer service over the phone, you can always connect with customer service online by logging into your account and initiating a live chat with customer service.
Lastly, you can visit a Citibank branch or contact them via mail at: Costco Consumer PO BOX 790046 ST. Louis, MO 63179-0046

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